Fluid pressure control device

ABSTRACT

A fluid pressure control device has a configuration in which board-holding units and of a resin case are inserted and fitted to mounting holes of a board to fix the board. The board-holding units have a connector side board-holding unit provided at a position on a connector housing side with respect to a connection portion, and a solenoid side board-holding unit provided at a position on a solenoid housing side with respect to the connection portion.

CROSS REFERENCE TO RELATED APPLICATION

This application is based on and incorporates herein by reference Japanese patent application No. 2006-316548 filed on Nov. 24, 2006.

FIELD OF THE INVENTION

The present invention relates to a fluid pressure control device having a solenoid valve for opening and closing a fluid channel, and a board on which an electronic component is arranged. In particular, the present invention is suitable for a fluid pressure control device for a vehicle brake system.

BACKGROUND OF THE INVENTION

FIG. 12 is a plan view showing a fluid pressure control device for a vehicle brake system of a prior art in a state where a board and a cover are removed. FIG. 13 is a cross-sectional view of the fluid pressure control device taken along a line XIII-XIII of FIG. 12. As shown in FIGS. 12 and 13, the fluid pressure control device for the vehicle brake system of the prior art includes a solenoid valve 2 for opening and closing a fluid channel through which brake fluid flows, a board 5 on which electronic components are arranged, a resin case 3 accommodating a solenoid 21 of the solenoid valve 2 and fixing the board 5, and the like.

The board 5 has the electronic components arranged thereon. An end of a connector terminal 6 is connected to the board 5. A plurality of mounting holes are formed at the board 5. The case 3 has a solenoid housing 32 accommodating the solenoid 21, a connector housing 33 accommodating a the other end of the connector terminal 6, and a connection portion 34 through which the solenoid housing 32 are connected to the connector housing 33. A plurality of board-holding units 36 and 37 are also formed at the case 3 and inserted and fitted to the mounting holes of the board 5 so as to fix the board 5. The board-holding units 36 and 37 are respectively provided at the connection portion 34 and the solenoid housing 32 (for example, see Japanese Unexamined Patent Application Publication No. 2002-368452).

However, since the fluid pressure control device for the vehicle brake system is generally mounted in an engine room of a vehicle, the resin case 3 may be deformed by heat generated at an engine. In particular, the connector housing 33 may noticeably warp because the connector housing 33 extends from the solenoid housing 32 in an overhanging manner.

More specifically, the case 3 may be deformed such that the connector housing 33 turns around an axis D of the connection portion 34 with respect to the solenoid housing 32. Accordingly, a solder bonding portion 7 between the connector terminal 6 and the board 5 may be displaced in an F direction.

A component in an x direction of the displacement in the F direction is restricted by the board-holding unit 37 provided at the connection portion 34. Another component in a y direction of the displacement causes a frictional resistance between the board-holding unit 37 provided at the connection portion 34 and the board 5. As a result, stresses are generated at the solder bonding portion 7 in both the x and y directions, thereby making solder cracking more likely to occur.

SUMMARY OF THE INVENTION

It is therefore an object of the present invention to reduce a stress generated at a bonding portion between a connector terminal and a board.

In an aspect of the present invention, a fluid pressure control device includes a body having a fluid channel, a solenoid valve having a solenoid exposed to the outside of the body. The solenoid valve is for opening and closing the fluid channel. The fluid pressure control device also includes a board and a resin case. An electronic component is arranged on the board, and a first end of a connector terminal is connected to the board. The board is attached to the resin case, and the case is fixed to the body. The case includes: a connector housing accommodating a second end of the connector terminal; a solenoid housing aligned with the connector housing in a direction parallel to the board and accommodating the solenoid; a connection portion integrally formed with the housings, the connection portion through which the housings are connected to each other, the connection portion and having a smaller external dimension (or thickness) in a direction orthogonal to the board than those of the housings; and a plurality of board-holding units which are inserted and fitted to a plurality of mounting holes formed at the board, so that the board is attached to the case. The board-holding units include a connector side board-holding unit provided at a position on the connector housing side with respect to the connection portion, and a solenoid side board-holding unit provided at a position on the solenoid housing side with respect to the connection portion.

Since a bonding portion between the connector terminal and the board is located near the connector side board-holding unit, the bonding portion is displaced with the connector side board-holding unit when the case is deformed by a heat load. Therefore, no relative displacement is generated in this occasion between the bonding portion and the connector side board-holding unit. Therefore, a resistance against the motion of the bonding portion during the deformation of the case can be reduced, and a stress generated at the bonding portion can be reduced.

A part of the solenoid side board-holding unit to be inserted and fitted to a corresponding one of the mounting holes may be elastically deformable toward the center of the mounting hole.

When the case is deformed by a heat load, the board is biased to rotate around the solenoid side board-holding unit, which serves as a fulcrum. The above configuration makes the rotation of the board easier, since the part of the solenoid side board-holding unit to be inserted and fitted to the mounting hole may be elastically deformable toward the center of the mounting hole. Accordingly, the stress generated at the board and the bonding portion can be reduced.

In addition, because of a reaction force against the elastic deformation, the outer periphery of the solenoid side board-holding unit can be firmly attached to the periphery of the solenoid side mounting hole easily. As a result, positioning of the board in a direction parallel to the board can be facilitated when the board is assembled to the case.

The solenoid side board-holding unit may be divided into a plurality of pieces by a slit extending orthogonally to the board.

With this configuration, the board can easily rotate along with the thermal deformation of the case since the elastic deformation of the solenoid side board-holding unit is easily achieved. Therefore, the resistance force against the motion of the bonding portion during the deformation of the case can be further reduced, and the stress generated at the board and the bonding portion can be further reduced.

The solenoid housing, the connection portion, and the connector housing, may be aligned in a reference direction. In this situation, the solenoid side board-holding unit may be disposed at a position in the solenoid housing wherein the position is farther from the connector housing than the center of the solenoid housing in the reference direction is.

With this configuration, the distance between the connector side board-holding unit and the solenoid board holing unit becomes large, that is, the radius of the rotation of the board during the case deformation becomes large. Therefore, the angle of the rotation of the board can be reduced, and accordingly the resistance force against the motion of the bonding portion during the deformation is further reduced. As a result, the stress generated at the bonding portion is further reduced.

A mounting-hole distance may be smaller than a holding-unit distance with the following four definitions.

-   First Definition: One of the mounting holes to which the connector     side board-holding unit is inserted and fitted is a connector side     mounting hole. -   Second Definition: The other one of the mounting holes to which the     solenoid side board-holding unit is inserted and fitted is a     solenoid side mounting hole. -   Third definition: The mounting-hole distance is a distance between a     position at a periphery of the connector side mounting hole, the     position being farthest from the solenoid side mounting hole, and a     position at a periphery of the solenoid side mounting hole, the     position being farthest from the connector side mounting hole. -   Fourth Definition: The holding-unit distance is a distance between a     position at an outer peripheral surface of the connector side     board-holding unit, the position being farthest from the solenoid     side board-holding unit, and a position at an outer peripheral     surface of the solenoid side board-holding unit, the position being     farthest from the connector side board-holding unit.

With this configuration, the board-holding units are partially press-fitted to the mounting holes. Therefore, the board is reliably fixed to the case when the board-holding units are inserted and fitted to the mounting holes.

The connector side board-holding unit may be press-fitted to a corresponding one of the mounting hole.

With this configuration, the board is reliably fixed to the case when the connector side board-holding unit is inserted and fitted to the mounting hole.

The connector side board-holding unit may be divided into a plurality of pieces by a slit extending orthogonally to the board.

The only one connector side board-holding unit may be provided. In other words, the connector side board-holding unit may be the only member of the board-holding units provided at a position on the connector housing side with respect to the connection portion.

With this configuration as compared with, for example, a case where a plurality of the connector side board-holding units are provided, the space for arranging the connector terminal can be easily obtained.

Otherwise, a plurality of the connector side board-holding units may be provided. In other words, the holding units may include a plurality of units provided at positions on the connector housing side of the connection portion, wherein the connector side board-holding unit is a member of the plurality of units.

With this configuration, as compared with, for example a case where the only one connector side board-holding unit is provided, the inclination of the board with respect to the case during assembling can be reduced.

The only one solenoid side board-holding unit may be provided. In other words, solenoid side board-holding unit may the only member of the board-holding units provided at a position on the solenoid housing side of the connection portion. In this situation, the solenoid side board-holding unit may have a convex portion which prevents the solenoid side board-holding unit from slipping out of a corresponding one of the mounting holes of the board.

With this configuration, the only one solenoid side board-holding unit having the protrusion is provided. Therefore as compared with, for example, a case where a plurality of the solenoid side board-holding units are provided, a restriction force against the rotation of the board caused by the protrusion during the deformation becomes small. As a result, the resistance force against the motion of the board during the deformation is reduced, and the stress generated at the board and the bonding portion can be reduced.

The above-described fluid pressure control device may be mounted on a vehicle, and brake fluid may flow through the fluid channel.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention, together with additional objective, features and advantages thereof, will be best understood from the following description, the appended claims and the accompanying drawings. In the drawings:

FIG. 1 is a plan view showing a fluid pressure control device according to a first embodiment of the present invention in a state where a board and a cover are removed;

FIG. 2 is a cross-sectional view of the fluid pressure control device taken along a line II-II of FIG. 1;

FIG. 3 is a cross-sectional view showing a portion B of FIG. 2;

FIG. 4 is a plan view showing a solenoid side board-holding unit 36 of FIG. 1;

FIG. 5 is a cross-sectional view taken along a line V-V of FIG. 4;

FIG. 6 is a plan view showing a board of FIG. 2;

FIG. 7 is a cross-sectional view of the fluid pressure control device taken along the line II-II of FIG. 1 in a state where a case is thermally deformed;

FIG. 8 is a cross-sectional view showing a primary portion of a fluid pressure control device according to a second embodiment of the present invention;

FIG. 9 is a cross-sectional view showing a primary portion of a fluid pressure control device according to a third embodiment of the present invention;

FIG. 10 is a plan view showing a case of a fluid pressure control device according to a fourth embodiment of the present invention;

FIG. 11 is a plan view showing a case of a fluid pressure control device according to a fifth embodiment of the present invention;

FIG. 12 is a plan view showing a conventional fluid pressure control device for a vehicle brake system in a state where a board and a cover are removed; and

FIG. 13 is a cross-sectional view of the conventional fluid pressure control device taken along a line XIII-XIII of FIG. 12.

DETAILED DESCRIPTION OF THE EMBODIMENTS First Embodiment

A first embodiment of the present invention is described below. The fluid pressure control device of this embodiment is used for a vehicle brake system that controls a braking force of a vehicle by controlling a brake fluid-pressure. Note that a vertical direction in FIG. 1 represents a vertical direction when the fluid pressure control device is mounted on the vehicle.

As shown in FIGS. 1 and 2, the fluid pressure control device includes a metal body 1 in which a fluid channel (not shown) through which brake fluid flows is formed. The body 1 has a plurality of solenoid valves 2 for opening and closing the fluid channel, a pump (not shown) for sucking and discharging the brake fluid, an electrical motor (not shown) for driving the pump, and the like.

Solenoids 21 of the solenoid valves 2 are fixed to a side surface of the body 1 by calking or the like. The solenoids 21 are exposed to the outside of the body 1. A resin case 3 is fixed to the body 1 using a screw (not shown) to cover the solenoid 21.

A coil wire (not shown) of each solenoid 21 is soldered to a solenoid terminal 22. The solenoid terminal 22 penetrates through a terminal hole 31 of the case 3 and extends to a below-described board housing chamber. A sealing member (not shown) is applied between the solenoid terminal 22 and the terminal hole 31 for sealing. In particular, for example, a flexible sealing member, such as silicon, is used to allow the solenoid terminal 22 to be easily displaced. The solenoid terminal 22 has a clinched part 221 which is bent into a crank-like shape so that the solenoid terminal 22 can be elastically deformed easily. The clinched part 221 is located in a below-described solenoid housing.

A resin cover 4 is bonded to the case 3 by welding or the like on the side of the case 3 opposite to the body 1. The case 3 and the cover 4 define a board housing chamber 41. A plate-like board 5 is accommodated in the board housing chamber 41. The board 5 has electronic components (not shown) on its surface. First ends of a plurality of connector terminals 6 which are formed at the case 3 by insert molding are soldered to the board 5, and also, the solenoid terminal 22 is soldered to the board 5.

The case 3 has a substantially rectangular parallelepiped solenoid housing 32 providing a space for accommodating the solenoids 21, a substantially rectangular parallelepiped connector housing 33 providing a space for accommodating second ends of the connector terminals 6, and a plate-like connection portion 34 through which the solenoid housing 32 is connected to the connector housing 33. The housings 32 and 33, and the connection portion 34 are integrally formed.

The housings 32 and 33, and the connection portion 34 are aligned in a direction (hereinafter referred to as a plate-face direction) parallel to the board 5. An external dimension of the connection portion 34 in a direction orthogonal to the plate-face direction of the board 5 is smaller than external dimensions of the housings 32 and 33 in the direction orthogonal to the plate-face-direction of the board 5.

In the case 3, a connector side board-holding unit 35 protruding toward the board 5 is formed at a position on the connector housing 33 side with respect to the connection portion 34, and two solenoid side board-holding units 36 protruding toward the board 5 are formed at positions on the solenoid housing 32 side with respect to the connection portion 34.

Hereinafter, a reference direction is defined to be an alignment direction of the solenoid housing 32, connection portion 34 and connector housing 33 (in this embodiment, a horizontal direction of FIGS. 1 and 2). The connector side board-holding unit 35 is disposed at a position near the center of the connector housing 33 in the reference direction Z. The solenoid side board-holding units 36 are disposed at positions in the solenoid housing 32, the positions being farther from the connector housing 33 than the center of the solenoid housing 32 in the reference direction Z is.

In addition, the two solenoid side board-holding units 36 are arranged away from each other in a direction orthogonal to the reference direction Z (in this embodiment, the vertical direction of FIG. 1). Hereinafter, if necessary, one of the two solenoid side board-holding units 36 located on the lower side in FIG. 1 is referred to as a first solenoid side board-holding unit 36 a, and the other one located on the upper side in FIG. 1 is referred to as a second solenoid side board-holding unit 36 b.

As shown in FIG. 6, the board Includes three hole forming portions, each forming and surrounding a connector side mounting hole 51 and two solenoid side mounting holes 52. The connector side mounting hole 51 are formed at a position corresponding to the connector side board-holding unit 35, and the connector side board-holding unit 35 is inserted and fitted to the connector side mounting hole 51. Each of the solenoid side mounting holes 52 are formed at a position corresponding to each of the solenoid side board-holding units 36, and the solenoid side board-holding units 36 are inserted and fitted respectively to the solenoid side mounting holes 52. The board-holding units 35 and 36 are inserted and fitted to the mounting holes 51 and 52, and accordingly, the board 5 is held by the case 3. Hereinafter one of the two solenoid side mounting holes 52 to which the first solenoid side board-holding unit 36 a is inserted and fitted is referred to as a first solenoid side mounting hole 52 a, and the other one to which the second solenoid side board-holding unit 36 b is inserted and fitted is referred to as a second solenoid side mounting hole 52 b.

In addition, ones of the hole forming portions corresponding to the connector side mounting hole 51, a first solenoid side mounting hole 52 a, and a second solenoid side mounting hole 52 a are respectively referred to as a connector hole forming portion, a first solenoid hole forming portion, and a second solenoid hole forming portion.

As shown in FIG. 3, the connector side board-holding unit 35 includes a column-shaped large-diameter column part 351 and a column-shaped small-diameter column part 352 protruding and extending from an end of the large-diameter column part 351. The outer diameter of the large-diameter column part 351 is larger than the diameter of the connector side mounting hole 51 (i.e. the inner diameter of the connector hole forming portion). The outer diameter of the small-diameter column part 352 is smaller than the diameter of the connector side mounting hole 51. The small-diameter column part 352 is inserted and fitted to the connector side mounting hole 51.

As shown in FIGS. 4 and 5, each of the solenoid side board-holding units 36 has a cylindrical supporting part 361 with an external diameter larger than the diameter of the solenoid side mounting hole 52 (i.e. the inner diameter of solenoid hole forming portion), and an insertion part 362 protruding and extending from the supporting part 361 and being inserted and fitted to the solenoid side mounting hole 52.

The insertion part 362 has a columnar shape at a portion near the supporting part 361, and has a shape of a truncated cone at a portion near a tip end thereof. The outer diameter of the columnar portion of the insertion part 362 is smaller than the diameter of the solenoid side mounting hole 52. The outer diameter of the truncated-cone portion at the tip end of the insertion part 362 (i.e. a minimum outer diameter) is smaller than the diameter of the solenoid side mounting hole 52. A convex portion 362 a is provided at the truncated-cone portion of the insertion part 362 at a position near the supporting part 361. The outer diameter of the convex portion 362 a is the largest in the truncated-cone portion, and is larger than the diameter of the solenoid side mounting hole 52. The insertion part 362 is divided into two pieces by a slit 363 extending orthogonal to the board 5. Because of this, the insertion part 362 is easily elastically deformable toward the center of the solenoid side mounting hole 52.

Herein, as shown in FIG. 6, a mounting-hole distance H is defined as a distance between a first inner peripheral position and a second inner peripheral position. The first inner peripheral position is at a periphery of the connector side mounting hole 51 (i.e. an inner peripheral surface of the connector hole forming portion) and is farthest from the first solenoid side mounting hole 52 a than any other position at the periphery of the connector side mounting hole 51 is. The second inner peripheral position is at a periphery of the first solenoid side mounting hole 52 a (i.e. an inner peripheral surface of the first solenoid hole forming portion) and is farthest from the connector side mounting hole 51 than any other position at the periphery of the first solenoid side mounting hole 52 a is. Also, as shown in FIG. 1, a holding-unit distance L is defined as a distance between a first outer peripheral position and a second outer peripheral position. The first outer peripheral position is at an outer peripheral surface of the small-diameter column part 352 of the connector side board-holding unit 35 and is farthest from the first solenoid side board-holding unit 36a than any other position at the outer peripheral surface of the small-diameter column part 352. The second outer peripheral position is at an outer peripheral surface of the insertion part 362 of the first solenoid side board-holding unit 36 a and is farthest from the connector side board-holding unit 35 than any other position at an outer peripheral surface of the insertion part 362 is.

The mounting-hole distance H is smaller than the holding-unit distance L. As described above, in the case where the mounting-hole distance H is smaller than the holding-unit distance L, a portion of the connector side board-holding unit 35 is press-fitted to the connector hole forming portion, and a portion of the first solenoid side board-holding unit 36 a is also press-fitted to the first solenoid hole forming portion. Accordingly, at the time when the board-holding units 35 and 36 are inserted and fitted to the mounting holes 51 and 52, the board 5 is reliably fixed to the case 3. Therefore, even when the board 5 is located below the case 3 when being soldered, the board 5 is not detached from the case 3. Meanwhile, the second solenoid side board-holding unit 36 b is not press-fitted to the second solenoid hole forming portion.

Since the fluid pressure control device according to this embodiment is mounted in an engine room (not shown) of the vehicle, the resin case 3 may be deformed by heat generated at an engine (not shown). FIG. 7 is a cross-sectional view of the fluid pressure control device taken along the line A-A of FIG. 1 and shows a state where the case 3 is thermally deformed.

As shown in FIG. 7, in the case 3, the connector housing 33 is deformed to rotate in the clockwise direction in FIG. 7 around an axis D of the connection portion 34 with respect to the solenoid housing 32. Due to this, a bonding portion 7 between the connector terminals 6 and the board 5 may be displaced in x and y directions shown in in FIG. 7.

Since the bonding portion 7 between the connector terminals 6 and the board 5 is located near the connector side board-holding unit 35 the bonding portion 7 is displaced with the connector side board-holding unit 35 when the case 3 Is deformed by a heat load. Therefore, no relative displacement is generated between the bonding portion 7 and the connector side board-holding unit 35. As a result, a resistance against the motion of the bonding portion 7 during the case deformation is reduced, and a stress generated at the bonding portion 7 is reduced, thereby hardly causing solder cracking.

In addition, when the case 3 is deformed by the heat load, the board 5 likely turns around the solenoid side board-holding unit 36 as a fulcrum, which serves as a fulcrum. Since the insertion part 362 of the solenoid side board-holding unit 36 is divided by the slit 363 and thus elastically deformable, that is, since the solenoid side board-holding unit 36 allows the board 5 to easily rotate along With the thermal deformation of the case 3, the resistance against the motion of the bonding portion 7 during the case deformation can be further reduced.

In addition, because of reaction of the elastic deformation, the outer periphery of the solenoid side board-holding unit 36 can closely comes in contact with the inner periphery of the solenoid hole forming portion easily. As a result, positioning of the board 5 in the plate-face direction can be facilitated when being assembled to the case 3.

The solenoid side board-holding unit 36 is disposed in the solenoid housing 32 on the side opposite to the connector housing 33 with respect to the center in the reference direction Z, and the distance between the connector side board-holding unit 35 and the solenoid side board-holding unit 36 is large. Therefore the radius of rotation of the board 5 during the case deformation is large, and the angle of rotation of the board 5 during the case deformation accordingly becomes small. As a result, the amount of deformation of the insertion part 362 of the solenoid side board-holding unit 36 becomes small, and the resistance against the motion of the bonding portion 7 during the case deformation is further reduced.

Since the solenoid side board-holding unit 36 is loosely fitted to the solenoid side mounting hole 52, the board 5 can be easily displaced in the x direction along with the thermal deformation of the case 3. Accordingly, the resistance against the motion of the bonding portion 7 during the case deformation can be further reduced.

Since the sealing member applied between the solenoid terminal 22 and the terminal hole 31 is flexible, and the clinched part 221 is provided for allowing the solenoid terminal 22 to be easily elastically deformed, the solenoid terminal 22 can be easily displaced in the x and y directions, thereby reducing the resistance against the motion of the board 5 during the case deformation.

In this embodiment, the connector side board-holding unit 35 is the only unit of the case 3 which is to be inserted and fitted to a mounting hole of the board 5 and which is provided at the connector housing 33 side with respect to the connection portion 34. Therefore, as compared with a case where a plurality of connector side board-holding units having the same feature as the connector side board-holding unit 35 are provided, the space for arranging the connector terminal 6 can be easily obtained.

Second Embodiment

A second embodiment of the present invention is described below. FIG. 8 is a cross-sectional view showing a primary portion of a fluid pressure control device according to this embodiment. The present embodiment is different from the first embodiment in that the dimensional relationship between the connector side board-holding unit 35 and the connector side mounting hole 51 is changed. A part shown in this embodiment is identical or equivalent to a part in the first embodiment if the same reference numeral is applied to the two parts. Descriptions for such a part are omitted in this embodiment.

As shown in FIG. 8, the outer diameter of the small-diameter column part 352 of the connector side board-holding unit 35 is larger than the diameter of the connector side mounting hole 51, and is press-fitted to the connector side mounting hole 51. Accordingly, the board 5 is firmly fixed to the case 3 at the time when the connector side board-holding unit 35 is press-fitted to the connector side mounting hole 51.

In this embodiment, the mounting-hole distance H does not have to be smaller than the holding-unit distance L.

Third Embodiment

A third embodiment of the present invention is described below. FIG. 9 is a cross-sectional view showing a primary portion of a fluid pressure control device according to this embodiment. The present embodiment is different from the first embodiment in that the shape of the connector side board-holding unit 35 is changed. A part shown in this embodiment is identical or equivalent to a part in the first embodiment if the same reference numeral is applied to the two parts. Descriptions for such a part are omitted in this embodiment.

As shown in FIG. 9, the connector side board-holding unit 35 has a cylindrical supporting part 353 with an external diameter larger than the diameter of the connector side mounting hole 51, and an insertion part 354 protruding and extending from the supporting part 353 and being inserted and fitted to the connector side mounting hole 51.

The insertion part 354 has a columnar shape at a portion near the supporting part 353, and has a shape of a truncated cone shape at a portion near a tip end thereof. The outer diameter of the columnar portion of the insertion part 354 is smaller than the diameter of the connector side mounting hole 51. The outer diameter of the truncated-cone portion at the tip end of the insertion part 354 (i.e. a minimum outer diameter) is smaller than the diameter of the connector side mounting hole 51. The outer diameter of the truncated-cone portion of the insertion part 354 near the supporting part 353 (i.e. a maximum outer diameter) is larger than the diameter of the connector side mounting hole 51. The insertion part 354 is divided into two pieces by a slit 355 extending orthogonally to the board 5, thereby being easily elastically deformable.

In this embodiment, the mounting-hole distance H does not have to be smaller than the holding-unit distance L.

Fourth Embodiment

A fourth embodiment of the present invention is described below. FIG. 10 is a plan view showing a case of a fluid pressure control device according to this embodiment. The present embodiment is different from the first embodiment in that the number of connector side board-holding units 35 is changed. A part shown in this embodiment is identical or equivalent to a part in the first embodiment if the same reference numeral is applied to the two parts. Descriptions for such a part are omitted in this embodiment.

As shown in FIG. 10, the case 3 has two connector side board-holding units 35 having the same feature as the connector side board-holding unit in the first embodiment. Though not shown, the board 5 has two connector hole forming unit respectively forming and surrounding two connector side mounting holes 51. Accordingly as compared with, for example, a case where only one connector side board-holding unit 35 is provided, the inclination of the board 5 with respect to the case 3 during assembling can be reduced.

Fifth Embodiment

A fifth embodiment of the present invention is described below. FIG. 11 is a plan view-showing a case of a fluid pressure control device according to this embodiment. The present embodiment is different from the fourth embodiment in that the number of solenoid side board-holding units 36 is changed. A part shown in this embodiment is identical or equivalent to a part in the first embodiment if the same reference numeral is applied to the two parts. Descriptions for such a part are omitted in this embodiment.

As shown in FIG. 11, the case 3 has only one of the solenoid side board-holding units 36 in the first embodiment. Though not shown, the board 5 has the only one solenoid hole forming portion and the only one solenoid side mounting hole 52 for the only solenoid side board-holding unit 36 in this embodiment.

Accordingly, since there is provided the only one solenoid side board-holding unit 36 having the convex portion 362 a as compared with, for example, a case where a plurality of solenoid side board-holding units 36 are provided, a restriction force against the turning of the board 5 caused by the convex portion 362 a during the case deformation becomes small. As a result, the resistance against the motion of the board 5 during the case deformation is reduced, and the stress generated at the board 5 and the bonding portion 7 can be reduced.

Other Embodiment

Although the fluid pressure control device for the vehicle brake system is described in the above embodiments, the present invention may be also applied to fluid pressure control device s for other purposes. 

1. A fluid pressure control device comprising: a body having a fluid channel; a solenoid valve having a solenoid exposed to the outside of the body, the solenoid valve for opening and closing the fluid channel; a board on which an electronic component is arranged, and to which a first end of a connector terminal is connected; and a resin case to which the board is attached, the case being fixed to the body, the case including: a connector housing accommodating a second end of the connector terminal; a solenoid housing aligned with the connector housing in a direction parallel to the board and accommodating the solenoid; a connection portion integrally formed with the housings, the connection portion through which the housings are connected to each other, the connection portion having a smaller external dimension in a direction orthogonal to the board than those of the housings; and a plurality of board-holding units which are inserted and fitted to a plurality of mounting holes formed at the board, so that the board is attached to the case, wherein the board-holding units include: a connector side board-holding unit provided at a position on the connector housing side of the connection portion; and a solenoid side board-holding unit provided at a position on the solenoid housing side of the connection portion.
 2. The fluid pressure control device according to claim 1, wherein a part of the solenoid side board-holding unit to be inserted and fitted to a corresponding one of the mounting holes is elastically deformable toward the center of the mounting hole.
 3. The fluid pressure control device according to claim 2, wherein the solenoid side board-holding unit is divided into a plurality of pieces by a slit extending orthogonally to the board.
 4. The fluid pressure control device according to claim 1, wherein: the solenoid housing, the connection portion, and the connector housing are aligned in a reference direction; and wherein the solenoid side board-holding unit is disposed at a position in the solenoid housing, and the position is farther from the connector housing than the center of the solenoid housing in the reference direction is.
 5. The fluid pressure control device according to claim 1, wherein a mounting-hole distance is smaller than a holding-unit distance, provided that: one of the mounting holes to which the connector side board-holding unit is inserted and fitted is a connector side mounting hole, and another one of the mounting holes to which the solenoid side board-holding unit is inserted and fitted is a solenoid side mounting hole; the mounting-hole distance is a distance between a position at a periphery of the connector side mounting hole, the position being farthest from the solenoid side mounting hole, and a position at a periphery of the solenoid side mounting hole, the position being farthest from the connector side mounting hole, and the holding-unit distance is a distance between a position at an outer peripheral surface of the connector side board-holding unit, the position being farthest from the solenoid side board-holding unit, and a position at an outer peripheral surface of the solenoid side board-holding unit, the position being farthest from the connector side board-holding unit.
 6. The fluid pressure control device according to claim 1, wherein the connector side board-holding unit is press-fitted to a corresponding one of the mounting holes.
 7. The fluid pressure control device according to claim 1, wherein the connector side board-holding unit is divided into a plurality of pieces by a slit extending orthogonally to the board.
 8. The fluid pressure control device according to claim 1, wherein the connector side board-holding unit is the only member of the board-holding units provided at a position on the connector housing side of the connection portion.
 9. The fluid pressure control device according to claim 1, wherein the board-holding units includes a plurality of units provided at positions on the connector housing side of the connection portion, the plurality of units including the connector side board-holding unit.
 10. The fluid pressure control device according to claim 1, wherein: the solenoid side board-holding unit is the only member of the board-holding units provided at a position on the solenoid housing side of the connection portion; and the solenoid side board-holding unit has a convex portion which prevents the solenoid side board-holding unit from slipping out of a corresponding one of the mounting holes of the board.
 11. The fluid pressure control device according to claim 9, wherein: the solenoid side board-holding unit is the only member of the board-holding units provided at a position on the solenoid housing side of the connection portion; and the solenoid side board-holding unit has a convex portion which prevents the solenoid side board-holding unit from slipping out of a corresponding one of the mounting holes of the board.
 12. The fluid pressure control device according to claim 1, wherein the fluid pressure control device is mounted on a vehicle, and brake fluid flows through the fluid channel. 